<template>
  <div id="home" class="wrapper">
    <nav-bar class="home-nav">
      <div slot="center">购物街</div>
    </nav-bar>
    <tab-control :titles="['流行', '新款', '精选']" @tabClick="tabClick" ref="tabControl1" class="tab-control"
      v-show="isTabFixed" />
    <scroll class="content" ref="scroll" :probe-type="3" @scroll="contentScroll" @pullingUp="loadMore"
      :pull-up-load="true">
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"></home-swiper>
      <recommend-view :recommends="recommends"></recommend-view>
      <feature-view></feature-view>
      <tab-control :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl2" v-show="!isTabFixed" />
      <good-list :goods="showGoods"></good-list>
    </scroll>
    <back-top @click.native="backClick" v-show="isShowBackTop" />
  </div>
</template>

<script>
import HomeSwiper from './chlidComps/HomeSwiper.vue'
import RecommendView from "./chlidComps/RecommendView.vue"
import FeatureView from './chlidComps/FeatureView.vue'

import NavBar from 'components/common/navber/NavBar.vue'
import TabControl from 'components/content/tabControl/TabControl.vue'
import GoodList from 'components/content/goods/GoodsList.vue'
import Scroll from '../../components/common/scroll/Scroll.vue'
import BackTop from '../../components/content/backTop/BackTop.vue'

import { getHomeMultidata, getHomeGoods } from "network/home"
// import {debounce} from 'common/utils'

export default {
  name: "Home",
  components: {
    HomeSwiper,
    RecommendView,
    FeatureView,
    NavBar,
    TabControl,
    GoodList,
    Scroll,
    BackTop,
  },
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        'pop': { page: 0, list: [] },
        'new': { page: 0, list: [] },
        'sell': { page: 0, list: [] },
      },
      currentType: 'pop',
      isShowBackTop: false,
      tabOffsetTop: 0,
      isTabFixed: false,
      saveY: 0,
    }
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list
    }
  },
  activated() {
    this.$refs.scroll.scroll.refresh()
    this.$refs.scroll.scrollTo1(0, this.saveY, 0)
  },
  deactivated() {
    this.saveY = this.$refs.scroll.getScrollY()
  },
  created() {
    // 请求多个数据
    this.getHomeMultidata1()

    // 请求商品数据
    this.getHomeGoods('pop')
    this.getHomeGoods('new')
    this.getHomeGoods('sell')

  },


  methods: {
    /* 
    // 事件监听的相关方法
     */

    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = 'pop'
          break
        case 1:
          this.currentType = 'new'
          break
        case 2:
          this.currentType = 'sell'
          break
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    // 回到坐标（0，0）
    backClick() {
      this.$refs.scroll.scrollTo1(0, 0, 500)
    },
    // 监测y轴并对其做判断（布尔值）
    contentScroll(position) {
      // 判断BackTop是否显示
      this.isShowBackTop = (-position.y) > 1000
      // 
      this.isTabFixed = (-position.y) > this.tabOffsetTop - 44
    },
    // 监测到上拉加载后调用getHomeGoods加载this.currentType下的数据
    loadMore() {
      this.getHomeGoods(this.currentType)
    },
    swiperImageLoad() {
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    },
    /*
    // 网络请求的相关方法
     */
    getHomeMultidata1() {
      getHomeMultidata().then(res => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      })
    },
    // 调取服务器里选取的数据
    getHomeGoods(type) {
      const page = this.goods[type].page + 1
      getHomeGoods(type, page).then(res => {
        this.goods[type].list.push(...res.data.list)
        this.goods[type].page += 1
        // 完成上拉后重置上拉更多
        // this.$refs.scroll.finishPullUp()
      })
    },
  },
}
</script>

<style scoped>
#home {
  /* padding-top: 44px; */
  height: 100vh;
  position: relative;
}

.home-nav {
  background-color: var(--color-tint);
  color: #fff;

  /* position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 99; */
}

/* .tab-control {
  position: sticky;
  top: 44px;
  z-index: 9;
} */


.content {
  height: calc(100% - 49px);
  overflow: hidden;
  /* overflow: hidden;

  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0; */
}

.tab-control {
  position: relative;
  z-index: 9;
}
</style>
